limits.h

cygwin, 著名的在win32下模拟unix操作系统的东东

/* limits.h

   Copyright 1999, 2000, 2001 Red Hat, Inc.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#ifndef _LIMITS_H___
#ifndef _MACH_MACHLIMITS_H_

/* _MACH_MACHLIMITS_H_ is used on OSF/1.  */
#define _LIMITS_H___
#define _MACH_MACHLIMITS_H_

/* Number of bits in a `char'.  */
#undef CHAR_BIT
#define CHAR_BIT 8

/* Maximum length of a multibyte character.  */
#ifndef MB_LEN_MAX
#define MB_LEN_MAX 1
#endif

/* Minimum and maximum values a `signed char' can hold.  */
#undef SCHAR_MIN
#define SCHAR_MIN (-128)
#undef SCHAR_MAX
#define SCHAR_MAX 127

/* Maximum value an `unsigned char' can hold.  (Minimum is 0).  */
#undef UCHAR_MAX
#define UCHAR_MAX 255

/* Minimum and maximum values a `char' can hold.  */
#ifdef __CHAR_UNSIGNED__
#undef CHAR_MIN
#define CHAR_MIN 0
#undef CHAR_MAX
#define CHAR_MAX 255
#else
#undef CHAR_MIN
#define CHAR_MIN (-128)
#undef CHAR_MAX
#define CHAR_MAX 127
#endif

/* Minimum and maximum values a `signed short int' can hold.  */
#undef SHRT_MIN
#define SHRT_MIN (-32768)
#undef SHRT_MAX
#define SHRT_MAX 32767

/* Maximum value an `unsigned short int' can hold.  (Minimum is 0).  */
#undef USHRT_MAX
#define USHRT_MAX 65535

/* Minimum and maximum values a `signed int' can hold.  */
#ifndef __INT_MAX__
#define __INT_MAX__ 2147483647
#endif
#undef INT_MIN
#define INT_MIN (-INT_MAX-1)
#undef INT_MAX
#define INT_MAX __INT_MAX__

/* Maximum value an `unsigned int' can hold.  (Minimum is 0).  */
#undef UINT_MAX
#define UINT_MAX (INT_MAX * 2U + 1)

/* Minimum and maximum values a `signed long int' can hold.
   (Same as `int').  */
#ifndef __LONG_MAX__
#ifndef __alpha__
#define __LONG_MAX__ 2147483647L
#else
#define __LONG_MAX__ 9223372036854775807L
# endif /* __alpha__ */
#endif
#undef LONG_MIN
#define LONG_MIN (-LONG_MAX-1)
#undef LONG_MAX
#define LONG_MAX __LONG_MAX__

/* Maximum value an `unsigned long int' can hold.  (Minimum is 0).  */
#undef ULONG_MAX
#define ULONG_MAX (LONG_MAX * 2UL + 1)

/* Minimum and maximum values a `signed long long int' can hold.  */
#ifndef __LONG_LONG_MAX__
#define __LONG_LONG_MAX__ 9223372036854775807LL
#endif

#if defined (__GNU_LIBRARY__) ? defined (__USE_GNU) : !defined (__STRICT_ANSI__)
#undef LONG_LONG_MIN
#define LONG_LONG_MIN (-LONG_LONG_MAX-1)
#undef LONG_LONG_MAX
#define LONG_LONG_MAX __LONG_LONG_MAX__

/* Maximum value an `unsigned long long int' can hold.  (Minimum is 0).  */
#undef ULONG_LONG_MAX
#define ULONG_LONG_MAX (LONG_LONG_MAX * 2ULL + 1)
#endif

#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
/* Minimum and maximum values a `signed long long int' can hold.  */
#undef LLONG_MIN
#define LLONG_MIN (-LLONG_MAX-1)
#undef LLONG_MAX
#define LLONG_MAX __LONG_LONG_MAX__

/* Maximum value an `unsigned long long int' can hold.  (Minimum is 0).  */
#undef ULLONG_MAX
#define ULLONG_MAX (LLONG_MAX * 2ULL + 1)
#endif

/* Maximum number of iovcnt in a writev */
#undef IOV_MAX
#define IOV_MAX (__INT_MAX__-1)

/* Maximum size of ssize_t */
#undef SSIZE_MAX
#define SSIZE_MAX (__LONG_MAX__)

/* Maximum length of a path */
#define PATH_MAX (260 - 1 /*NUL*/)

/* Max num groups for a user, value taken from NT documentation */
/* Must match <sys/param.h> NGROUPS */
#define NGROUPS_MAX 16

/* WaitForMultipleObjects can't handle waiting for more than 64 objects.
   This limits how many children we can fork/spawn off. */
#define CHILD_MAX 63

/* # of open files per process. Actually it can be more since Cygwin
   grows the dtable as necessary. We define a reasonable limit here
   which is returned by getdtablesize(), sysconf(_SC_OPEN_MAX) and
   getrlimit(RLIMIT_NOFILE). */
#undef OPEN_MAX
#define OPEN_MAX 256

/* # of bytes in a pipe buf. This is the max # of bytes which can be
   written to a pipe in one atomic operation. */
#undef PIPE_BUF
#define PIPE_BUF 4096

/* POSIX values */
/* These should never vary from one system type to another */
/* They represent the minimum values that POSIX systems must support.
   POSIX-conforming apps must not require larger values. */
#define	_POSIX_ARG_MAX		4096
#define _POSIX_CHILD_MAX	6
#define _POSIX_LINK_MAX		8
#define _POSIX_MAX_CANON	255
#define _POSIX_MAX_INPUT	255
#define _POSIX_NAME_MAX		14
#define _POSIX_NGROUPS_MAX	0
#define _POSIX_OPEN_MAX		16
#define _POSIX_PATH_MAX		255
#define _POSIX_PIPE_BUF		512
#define _POSIX_SSIZE_MAX	32767
#define _POSIX_STREAM_MAX	8
#define _POSIX_TZNAME_MAX       3

#endif /* _MACH_MACHLIMITS_H_ */
#endif /* _LIMITS_H___ */